Opus 5.5 at Medium Beats GPT-6 Astra Max on GDPval-AA at ~80% Lower Cost
nicolechirps · x · 2026-09-23
A comparison post claims that on the GDPval-AA benchmark, Claude Opus 5.5 at the medium setting outperforms GPT-6 Astra at its highest setting.
Estimated cost per task:
- Opus 5.5: $0.85
- GPT-6 Astra: $4.50
That's a better score at roughly 80% lower cost, per the post's screenshot. Benchmark details and sample sizes are not provided in the tweet itself.
Related event: Anthropic Launches Claude Opus 5.5: Stronger, 40% Cheaper, Tops AA Index(259 posts)→
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